Instruction Manual

MAX8730
Low-Cost Battery Charger
_______________________________________________________________________________________ 7
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
INPUT-CURRENT REGULATION
CSSP-to-CSSN Full-Scale
Current-Sense Voltage
72.75 78.25
mV
V
CLS
= REF (trim point)
72.75 78.25
mV
V
CLS
= REF x 0.7
50.0 56.0
mVInput Current-Limit Accuracy
V
CLS
= REF x 0.5
36.00 40.50
mV
CSSP/CSSN Input Voltage Range
8.0 28 V
CSSP/CSSN Input Current V
CSSP
= V
CSSN
= V
SRC
> 8.0V
1000
µA
CLS Input Range 1.1
REF
V
IINP Transconductance V
CSSP
- V
CSSN
= 56mV
2.66 2.94
µA/mV
V
CSSP
- V
CSSN
= 100mV, V
IINP
= 0 to 4.5V
-5 +5
V
CSSP
- V
CSSN
= 75mV -8 +8
V
CSSP
- V
CSSN
= 56mV -5 +5
IINP Accuracy
V
CSSP
- V
CSSN
= 20mV
-12.5 +12.5
%
IINP Gain Error
Based on V
I C T L
= RE F x 0.5 and V
I C T L
= RE F
-7 +7 %
IINP Offset Error
Based on V
I C T L
= RE F x 0.5 and V
I C T L
= RE F
-2 +2 mV
IINP Fault Threshold IINP rising 4.1 4.3 V
SUPPLY AND LINEAR REGULATOR
SRC Input Voltage Range 8.0 28 V
SRC falling 7
SRC Undervoltage Lockout
Threshold
SRC rising 8
V
Normal mode 6 mA
V
INPON =
V
REFON
= low
20
V
INPON = low,
V
REFON
= high
600
V
INPON = high,
V
REFON
= low
600
SRC Quiescent Current
(INPON/REFON = Don’t Care)
SRC
= V
BATT =
12V, ASNS =
GND
(Note 2)
V
INPON =
V
REFON
= high
600
µA
BATT Input Current
V
BATT
= 2V to 19V, V
SRC
> V
BATT
+ 0.3V
600 µA
V
REFON
= 5.4V
600
Battery Leakage Current
I
CSIP
+ I
CSIN
+ I
BATT
+ I
CSSP
+ I
CSSN
+ I
SRC
,
ASNS = REFON = GND
INPON = GND
16
µA
LDO Output Voltage 8.0V < VSRC < 28V, no load 5.2 5.5 V
LDO Load Regulation 0 < I
LDO
< 10mA 50 mV
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1. V
SRC
= V
ASNS
= V
CSSP
= V
CSSN
= 18V, V
BATT
= V
CSIP
= V
CSIN
= 12V, V
VCTL
= V
ICTL
= 1.8V, MODE = float,
ACIN = 0, CLS = REF, REFON = LDO, INPON = LDO, RELTH = 2V. T
A
= -40°C to +85°C, unless otherwise noted.)